What was operation Neptune and when did it began?

Operation Neptune was the maritime component of the larger Operation Overlord, which aimed to establish a foothold in Normandy, France, during World War II. It began on June 6, 1944, commonly known as D-Day, when Allied forces launched a massive amphibious assault on five beachheads along the Normandy coast. This operation was crucial for opening a new front in Europe against Nazi Germany.